Looking for Ancestors of Albert Allison Johnson

I am the Great granddaughter of Albert "Doc" Allison Johnson. He was born November 26, 1886 (place unknown) and died in San Bernadino, CA January 23, 1966. I have hit a wall trying to trace his ancestors. He married my great Grandmother Lena "Birdie" Condren in Hughes County, Oklahoma on September 13, 1911. Any help would be appreciated.